I got an email yesterday from Andy Penaluna who has a very interesting and well-done airbrush history site. Here Is A Link To The Site
Click the image on the main page to enter the site, and there is a time line at the bottom of the page. You can move through the site by clicking on the years or by clicking the [Next>>] link. Most of the artwork is very well done and interesting to look at. For the year 1885 there is a QuickTime video of the only functioning (according to him) 1885 Walkup airbrush in the world and also a link to the completed picture he is drawing with it.
An interesting site, and well worth spending a little while looking over.